copy

问题 I am slowly trying to understand the difference between view s and copy s in numpy, as well as mutable vs. immutable types. If I access part of an array with 'advanced indexing' it is supposed to return a copy. This seems to be true: In [1]: import numpy as np In [2]: a = np.zeros((3,3)) In [3]: b = np.array(np.identity(3), dtype=bool) In [4]: c = a[b] In [5]: c[:] = 9 In [6]: a Out[6]: array([[ 0., 0., 0.], [ 0., 0., 0.], [ 0., 0., 0.]]) Since c is just a copy, it does not share data and

问题 I have an object that I need to copy in Java. I need to create a copy and run some tests on it without changing the original object itself. I assumed that I needed to use the clone() method, but this is protected. Having done some research on the net, I can see that this can be overriden with a public method in my class. But I cannot find an explanation on how to do this. How could this be done? Also, is this the best way of achieving what I need? 回答1: Another option by using Copy Constructor

问题 How can I copy a directory using Boost Filesystem? I have tried boost::filesystem::copy_directory() but that only creates the target directory and does not copy the contents. 回答1: bool copyDir( boost::filesystem::path const & source, boost::filesystem::path const & destination ) { namespace fs = boost::filesystem; try { // Check whether the function call is valid if( !fs::exists(source) || !fs::is_directory(source) ) { std::cerr << "Source directory " << source.string() << " does not exist or

问题 Is there a possibility to copy to clipboard from a TextView UI component only the selected text? I've catched the long press event and I copied the full text to clipboard, but now I want to specify the start and the end of the selection to be copied from a TextView. Thank you. 回答1: TextView tv; String stringYouExtracted = tv.getText().toString(); int startIndex = tv.getSelectionStart(); int endIndex = tv.getSelectionEnd(); stringYouExtracted = stringYouExtracted.subString(startIndex, endIndex

问题 Alright, I've done some searching and seem to be coming close to the answer I'm looking for. But for fear of messing something up with my current project (I'm a first time app developer and I'm quite pleased so far... I'd like to stay that way), I'm looking for a nice and clear step by step on how to copy a project. I know some things in certain places need to be imported/renamed but I'm not sure exactly what/where. So, is there a good step by step on how to do this or am I missing it? If not

问题 In bash I need to do this: take all files in a directory copy them into an existing directory How do I do this? I tried cp -r t1 t2 (both t1 and t2 are existing directories, t1 has files in it) but it created a directory called t1 inside t2, I don't want that, I need the files in t1 to go directly inside t2. How do I do this? 回答1: What you want is: cp -R t1/. t2/ The dot at the end tells it to copy the contents of the current directory, not the directory itself. This method also includes

问题 I have a Table (call it A_table ) in a database (call it A_db ) in Microsoft SQL Server Management Studio, and there are 10 rows. I have another database (call it B_db ), and it has a Table (call it B_table ), which has the same column settings as A_table has. But the B_table is empty. What I want: Copy every rows from A_table to B_table . Is there any option in Microsoft SQL Server Management Studio 2012 , to create an insert SQL from a table? Or is there any other option to do that? 回答1:

问题 Anyone know the keyboard shortcut to copy/paste a line into a new line in Eclipse , without having to highlight the entire line? ctrl - alt - down turns my whole screen upside down (I'm on windows). Interestingly, that's what's specified in the windows->preferences. 回答1: Ctrl - Alt - Down : copies current line or selected lines to below Ctrl - Alt - Up :: copies current line or selected lines to above Ctrl - Shift - L : brings up a List of shortcut keys See Windows/Preference->General->Keys.

问题 I am writing an iOS app. In my app, I want to copy some files from one folder to another. But because some files is too large, it will take a long time to finish the copy. So I want to add a progress bar to show the percentage of the copy. But I find that the file manager has no callback method to get the percentage. Does anyone have the good solution to it? 回答1: In high level : Run your copying process in a seperate thread (T1) Run another thread (T2) which reads periodically (say every

问题 How to copy list in Kotlin? I'm using val selectedSeries = mutableListOf<String>() selectedSeries.addAll(series) Is there a easier way? 回答1: This works fine. val selectedSeries = series.toMutableList() 回答2: I can come up with two alternative ways: 1. val selectedSeries = mutableListOf<String>().apply { addAll(series) } 2. val selectedSeries = mutableListOf(*series.toTypedArray()) Update: with the new Type Inference engine(opt-in in Kotlin 1.3), We can omit the generic type parameter in 1st